Method of casting plate-glass.



W. L. CLAUSE.

METHOD OF CASTING PLATE GLASS.

y APPLTCATIOH FILED 1AN.12,1912.

/f/ .ffm/iff A] W /ATTORNEY WILLIAM: L. CLAUSE, OF PITTSBURGH, PENNSYLVANA, ASSIGNOR T0 PITTSBURGH PLATE GLASS COMPANY, A. COBJEORA'LION OF PENNSYLVANIA.

Mn'rrron or cesfrme etarra-GLASS.

Specification of Letters Patent.

Yatented Apr. i,

.ppic-aton ed January 12, 191%. Serial No. 679,746.

To all whom t may concern:

Be it known that l, WILLIAM L. CLAUSE, a citizen of the United States, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in 'Methods of Casting Plate-Glass, of which the following is a specification.

The invention relatesv to casting plate glass, and 'it has for its primary objects: the provision of an improved method of getting the glass out of the tank and properly placing it on the casting table previous to the rolling operation. These, together with such other objects as may hereinafter appear or are incidental to my invention attain. by means of a construct-ion illustrated in preferred form in the accompanying drawings, uf'herein Figure 1 is al diagrammatic plan view of the glass tank, casting tab-le and leer, together with my improved mean-s for securing a distribution of the glass metal on the casting table; and Fig. 2 is a side elevation of' Fig. -1, partly in section.

ln carrying out. my method, I employ a construction of tank which comprises two compartments, 7 .and S, suitably connected by a passage or connection 9. The compartment 7 is the melting furnace proper, and the compartment 8 is a refining compartment into which the glass metal flows from the melting compartment. The compartment 7 is maintained at a temperature of approximately 255Go Flirt7 and the refining compartment at approximately 2000O Fhr., which-has `.'\en found to be the temperature best suited for the casting operation. The refining compartment 8 is provided with a discharge spout 10, which may be either a gravityor nongravity spo t, adjacent which is located the casting tab e 11, having the usual roller 12 for rolling the glass into sheets. The spout is closed by the gate 1?), and both spout and gate are maintained by the jets 17 at approximately the same temperature as that of the refining compartment.

1t will be noted that the casting table 11 and roller 12 are positioned at an angle of 90C to the tank and spout, instead of heing parallel thereto. the table lby. means of a U-shaped hoe-iilre implement 14 which is inserted into the tank 8 through the gate and immersed or-'pai`- tially immersed in the glass. On being with.- drawn from the-tank, it carries along the glass segregated between its rearwardly projecting wings 15' and during the continued movement ot' ,the hoe across the table 11, the glass metal thus withdrawn is properly depositedand spread on the table, the continuation of the movement carrying the chilled glass adjacent the hoe clear past the table where it falls as waste and is thus prevented from becoming incorporated in the manufactured sheet or plate. The glass is then rolled by the roller 12 in the usual manner and the piate of glass formed is mpved into the leer 16 where it is annealed the usual manner. The Vhoe 14 is of a size to segregate large quantity et glass, siif'ficient, it' desired, to form an entire sheet or plate, and in order to properly manipurlate it, I have provided a hoist 18 supported Ifrom a crane 19 traveling onthe tracks Q0, the shaft 21 of thehoist being adjusted ver tically by means of a rack and pinion, or other suitable mechanism. This arrangement permits of any movementlongitudinally` laterally and vertically as may be found necessary to secure proper distribution of Lthe lglass on thecasting table. The hoe is loosely supported at the end of the shaft Q1 in such manner that it may be tilt ed to secure its immersion in the tank.

By maintaining the spout and gate at the same temperature as the refining cham benthe glass is brought to the table in a condition best suitable "for rolling. @ther advantages will appear to those familiar with the art.

Having thus described my invention and illustrated its use, what i claim as new and' desire to secure by Letters Patent is the following The herein described process of casting plate glass from a tank having an outlet spout adjacent the surface of. the glass, which consists in engaging a body of glass *in the tanlr at a point remote from. the out-- let spout with a raking tool, and drawing The glass is drawn onto such body of glass to the outlet spout and signed my naine 'iii the presence of the two therethrough upon e casting table, and then subscribed Witnesses. spreading and rolling the glass, heat being f Vapplied to the said spout to prevent chilling l 5 {offthe glass before its application to the Witnesses:

casting table. V v C.' S. LAM@ In testimony whereof I have hereunto M. L. COCHRAN.

W. L. CLAUSE. 

